Optimum dredging time for inhibition and prevention of algae-induced black blooms in Lake Taihu, China

Dredging, which is the removal of polluted surface sediments from a water body, is an effective means of preventing the formation of algae-induced black blooms. However, an inappropriate dredging time may contribute to rather than inhibit the formation of black blooms. To determine the optimum dredg...

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Bibliographic Details
Published in:Environmental science and pollution research international 2016-07, Vol.23 (14), p.14636-14645
Main Authors: Chen, Chao, Zhong, Ji-Cheng, Yu, Ju-Hua, Shen, Qiu-Shi, Fan, Cheng-Xin, Kong, Fan-Xiang
Format: Article
Language:English
Subjects:
Algae
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
China
Dredging
Drinking water
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental science
Eutrophication
Geologic Sediments - analysis
Laboratories
Lakes
Lakes - chemistry
Odors
Pallets
Prevention
Research Article
Sediments
Studies
Sulfides
Sulfur
Time Factors
Waste Water Technology
Water - chemistry
Water Management
Water Pollutants, Chemical - analysis
Water Pollution Control
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Summary:Dredging, which is the removal of polluted surface sediments from a water body, is an effective means of preventing the formation of algae-induced black blooms. However, an inappropriate dredging time may contribute to rather than inhibit the formation of black blooms. To determine the optimum dredging time, four treatments were simulated with sediment samples collected from Lake Taihu: dredging in January 2014 (DW), April 2014 (DA), July 2014 (DS), and no dredging (UD). Results showed that typical characteristics associated with black blooms, such as high levels of nutrients (NH 4 + -N and PO 4 3− -P), Fe 2+ , ∑S 2− ([HS − ] + [S 2− ]), and volatile organic sulfur compounds (VOSCs), including dimethyl sulfide (DMS), dimethyl disulfide (DMDS), and dimethyl trisulfide (DMTS), were more effectively suppressed in the water column by DW treatment than by UD treatment and the other two dredging treatments. The highest concentrations of NH 4 + -N and PO 4 3− -P in the UD water column were 4.09 and 4.03 times, respectively, those in the DW water column. DMS levels in the UD and DS water columns were significantly higher ( p  
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-016-6627-z